EP0035348B1 - Gesinterte Formkörper aus Verbundwerkstoffen und ihre Herstellung - Google Patents

Gesinterte Formkörper aus Verbundwerkstoffen und ihre Herstellung Download PDF

Info

Publication number
EP0035348B1
EP0035348B1 EP81300719A EP81300719A EP0035348B1 EP 0035348 B1 EP0035348 B1 EP 0035348B1 EP 81300719 A EP81300719 A EP 81300719A EP 81300719 A EP81300719 A EP 81300719A EP 0035348 B1 EP0035348 B1 EP 0035348B1
Authority
EP
European Patent Office
Prior art keywords
alumina
aluminium
sintered
proportion
aluminium alloy
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP81300719A
Other languages
English (en)
French (fr)
Other versions
EP0035348A3 (en
EP0035348A2 (de
Inventor
Evan John Nestorides
Robert John Dower
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British Internal Combustion Engine Research Institute
UK Secretary of State for Industry
Original Assignee
British Internal Combustion Engine Research Institute
UK Secretary of State for Industry
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=10511704&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0035348(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by British Internal Combustion Engine Research Institute, UK Secretary of State for Industry filed Critical British Internal Combustion Engine Research Institute
Publication of EP0035348A2 publication Critical patent/EP0035348A2/de
Publication of EP0035348A3 publication Critical patent/EP0035348A3/en
Application granted granted Critical
Publication of EP0035348B1 publication Critical patent/EP0035348B1/de
Expired legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
    • C22C32/001—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides
    • C22C32/0015—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides with only single oxides as main non-metallic constituents
    • C22C32/0036—Matrix based on Al, Mg, Be or alloys thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/02—Pistons  having means for accommodating or controlling heat expansion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F2200/00—Manufacturing
    • F02F2200/04—Forging of engine parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/02—Light metals
    • F05C2201/021—Aluminium

Definitions

  • This invention relates to bodies formed by sintering together mixtures of two or more particulate materials, and to articles incorporating or formed from such bodies, the invention having particular application to pistons for internal combustion engines, and to the manufacture of such pistons.
  • crown portion of an internal combustion engine piston it is desirable for the crown portion of an internal combustion engine piston to have a high mechanical strength under the temperatures encountered under normal operating conditions.
  • a body formed wholly or in part of aluminium and/or aluminium alloy powder and alumina, which have been compacted and sintered to form a sintered mass is characterised in that the mass includes at least 10% by weight of said alumina which has been added, in powder form, to the aluminium and/or aluminium alloy powder prior to compacting and sintering, and in that the sintered mass has been reshaped under pressure after sintering.
  • the incorporation of at least 10% alumina in powdered form together with the step of reshaping under pressure after sintering results in a body having an unexpectedly high hot strength, and a body formed in this maner is accordingly particularly suitable for forming the crown of an internal combustion engine piston.
  • the particle size of the aluminium or aluminium alloy powder and the alumina powder preferably lies between dust and 125 microns.
  • a body in accordance with the invention may constitute the whole of an article, such as a piston, or only part of an article, for example the crown portion of a piston.
  • the proportions of aluminium and/or aluminium alloy powder and alumina powder may be different for different regions and vary in a controlled manner from one region of the body to an adjacent region.
  • the thickness of a region with or without a controlled graded change may be from about one millimetre to ten centimetres, or greater, depending upon the nature and intended use of the body.
  • a body in accordance with the invention may be formed of a plurality of layers incorporating different proportions of alumina, and bonded together in any convenient manner, for example by sintering. Where there are three or more layers these may be bonded together simultaneously or successively.
  • the reshaping of the body as by forging under heat and pressure in accordance with the invention may take place after all or some of the layers have been bonded together.
  • a body in accordance with the invention forms only part of an article it may, for example, be bonded to another part of the article, where this is of a mainly metallic nature, by friction welding, by sintering under pressure, or in any other suitable manner, after the reshaping of the body.
  • Said other part of the article may be formed of aluminium and/or an aluminium alloy and may also incorporate a proportion of alumina powder.
  • an article may comprise a body in accordance with the invention having a relatively high proportion of alumina forming a first region of the article, an intermediate region having a relatively smaller proportion of alumina and a third region having a smaller or zero proportion of alumina.
  • composition of the intermediate region in such an article may vary in such a case, the region having a relatively high proportion of alumina adjacent the first region and a lower or zero proportion of alumina adjacent the third region.
  • the regions can have the same thickness or different thicknesses depending upon operational requirements.
  • the invention has particular application to pistons for internal combustion engines.
  • a piston has a crown portion formed of controlled proportions of aluminium and/or an aluminium alloy powder and alumina powder which powders have been mixed together, and a skirt portion formed of aluminium and/or an aluminium alloy with a smaller or zero proportion of alumina.
  • the composite piston is compacted and sintered, and the resultant mass is reshaped under pressure after sintering.
  • the crown portion may be compacted, sintered, and shaped under pressure, and then joined to the skirt portion, with or without subsequent reshapping of the entire piston under pressure.
  • the piston may conveniently have an intermediate region in which the proportion of alumina is intermediate that of the crown and the skirt, and may vary from a maximum adjacent the crown to a minimum adjacent the skirt.
  • the proportion of alumina to aluminium and/or aluminium alloy may vary from the skirt to the crown within the range 0 to 50% by weight.
  • the proportion of alumina to aluminium and/or aluminium alloy is from 10% to 50% at the crown, and from 0 to 10% at the skirt.
  • the intermediate portion may form part of the composite piston, which is compacted, sintered and reshaped after sintering.
  • the intermediate portion may form part of the crown portion, or of the skirt portion, which are joined together with or without subsequent reshaping of the entire piston under pressure, and with or without an intermediate surface treatment.
  • the invention includes within its scope the manufacture of a body of composite material including the steps compacting a quantity of aluminium and/or an aluminium alloy powder and sintering to form a sintered mass, and characterised in that at least 10% by weight of alumina is mixed with the aluminium and/or aluminium alloy powder prior to compacting and sintering, and in that the sintered mass is reshaped under pressure.
  • the piston illustrated therein comprises a crown portion 1, an intermediate portion 2, and a skirt portion 3.
  • the crown portion 1 consists of a mixture of aluminium powder and/or an aluminium alloy powder having a particle size of between dust and 125 microns, and between 50 and 10% by weight of alumina powder of approximately the same particle size.
  • the skirt portion 3 similarly consists of the same particle size as in the crown with only a small or zero proportion of alumina.
  • the intermediate portion as indicated by the broken lines 2 between the crown portion 1 and the skirt portion 3 is also formed of a mixture of aluminium and/or aluminium alloy powder and alumina, the proportion of the alumina being intermediate those of the crown portion and the skirt portion.
  • the intermediate portion 2 may have a higher proportion of alumina adjacent the crown portion and a lower proportion (which may be zero) of alumina adjacent the skirt portion, the proportion of alumina in such a case preferably varying in a continuous manner throughout the portion.
  • the body forming the crown portion extends down along the sides of the piston and is machined or formed with a series of grooves 4 for accommodating the compression rings.
  • crown portion, the intermediate portion, and the skirt portion, with their individual mixtures, are compacted, and sintered together, the resultant mass being shaped thereafter to its final shape under heat and pressure.
  • the proportion of alumina in the skirt may be graded, varying from a maximum, which may be comparable with that in the crown portion, adjacent the latter, to a minimum, which may be zero, furthest from the crown portion.
  • the crown portion is compacted, sintered and shaped under heat and pressure separately and this procedure is also applied to the intermediate portion and to the skirt portion. The individual portions are then bonded together and pressed under heat and high pressure to their final shape.
  • crown portion with the intermediate portion, may be bonded to the skirt portion by friction welding or in any other convenient manner
  • the material forming the crown portion 1 provides most of the mechanical hot strength of the piston, and has a lower thermal conductivity than the skirt portion, or the intermediate portion where provided.
  • the compression ring grooves 4 are formed in an annular body 5 which is fabricated separately from the crown portion 1, but which similarly comprises a mixture of aluminium alloy powder with between 10 and 50% by weight of alumina powder.
  • the powders are similarly mixed together compacted and sintered, and subsequently shaped under heat and pressure prior to being bonded to the skirt portion.
  • the crown portion 1 and the body 5 are conveniently supported in the appropriate relative positions in a suitable mould, and the skirt portion formed in situ in the mould, and simultaneously bonded to the crown portion and the body 5.
  • skirt portion itself need not be formed by powder process but may be cast from molten metal or fabricated in any other convenient manner.
  • bodies in accordance with the invention may also be used to advantage in the construction of other articles, for example solid or hollow cylinders or tapered sections, with or without ribs or flanges, casings, turbine blades and combustors.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • General Engineering & Computer Science (AREA)
  • Composite Materials (AREA)
  • Manufacturing & Machinery (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Powder Metallurgy (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Claims (14)

1. Formkörper, der ganz oder teilweise aus Aluminium und/oder eine Aluminiumlegierungpulver und Aluminiumoxid gebildet ist, die verdichtet und gesintert wurden, um eine gesinterte Masse zu bilden, dadurch gekennzeichnet, daß die Masse wenigstens 10 Gewichtprozent Aluminiumoxid enthält, das in Pulverform dem Aluminium- und/oder Aluminiumlegierungpulver vor dem Verdichten und Sintern zugefügt wurde, und daß die gesinterte Masse unter Druck nach dem Sinterne regeneriert wurde.
2. Formkörper nach Anspruch 1, gekennzeichnet durch zwei oder mehr Bereiche mit unterschiedlichen Mengenverhältnissen von Aluminium- und/oder Aluminiumlegierungpulver und Aluminiumoxidpulver.
3. Formkörper nach Anspruch 2, dadurch gekennzeichnet, daß der Anteil von Aluminiumoxid in einer gesteuerten Weise von einem Bereich des Formkörpers zu einem angenzenden Bereich variiert.
4. Formkörper nach Anspruch 1, dadurch gekennzeichnet, daß er einen Teil eines Gegenstandes Bildet, von dem ein anderer Teil im wesentlichen metallisch ist, wobei der Formkörper mit dem anderen Teil des Gegenstandes verbunden ist.
5. Formkörper nach Anspruch 4, dadurch gekennzeichnet, daß der andere Teil des Formkörpers aus Aluminium oder einer Aluminiumlegierung mit oder ohne einen Anteils von Aluminiumoxid gebildet ist.
6. Formkörper nach Anspruch 3, gekennzeichnet durch einen ersten Bereich mit einem relativ hohen Anteil von Aluminiumoxid, einen Zwischenbereich mit einem relativ geringeren Anteil von Aluminiumoxid und einen dritten Bereich mit einem kleineren Anteil oder einem Anteil von Null von Aluminiumoxid.
7. Formkörper nach Anspruch 6, dadurch gekennzeichnet, daß der Zwischenbereich einen relativ hohen Anteil von Aluminiumoxid nahe dem ersten Bereich und einen geringen Anteil oder Anteil von Null von Aluminiumoxid nahe dem dritten Bereich hat.
8. Formkörper nach Anspruch 1, dadurch gekennzeichnet, daß er wenigstens der Kopfabschnitt des Kolbens einer Verbrennungskraftmaschine bildet.
9. Herstellung eines Formkörpers aus Verbundwerkstoffen mit den Schritten der Verdichtung einer Masse von Aluminium und/oder einem Aluminiumlegierungpulver und Aluminiumoxid und des Sinterns zur Ausbildung einer gesinterten Masse, dadurch gekennzeichnet, daß wenigstens 10 Gewichtsprozent des Aluminiumoxids in Pulverform mit dem Aluminium und/oder Aluminiumlegierungpulver vor dem Verdichten und Sintern vermischt wird, und daß die gesinterte Masse unter Druck regeneriert wird.
10. Herstellung eines Formkörpers nach Anspruch 9, dadurch gekennzeichnet, daß mehrere gesinterte und geformte Massen mit verschiedenen Mengenverhältnissen von Aluminium- und/oder Aluminiumlegierungpulver und Aluminiumoxidpulver getrennt gebildet werden, wobei wenigstens eine davon wenigstens 10 Gewichtprozent Aluminiumoxid enthält und daß anschließend die Massen miteinander verbunden werden.
11. Herstellung eines Formkörpers nach Anspruch 9, dadurch gekennzeichnet, daß mehrere gesinterte Massen mit unterschiedlichen Mengenverhältnissen von Aluminium- und/oder Aluminiumlegierungpulver und Aluminiumoxidpulver getrennt gebildet werden, wobei wenigstens eine davon wenigstens 10 Gewichtprozent Aluminiumoxid enthält, daß die gesinterten Massen miteinander verbunden werden und daß der Formkörper nach der Verbindung der gesinterten Massen regeneriert wird.
12. Kolben für eine Verbrennungskraftmaschine, mit verschiedenen Teilen, die aus Aluminium und/oder einem Aluminiumlegierungpulver mit unterschiedlichen Anteilen von Aluminiumoxid gebildet sind, und mit einem Kopfabschnitt (1), der wenigstens 10% Aluminiumoxid enthält, und einem unteren Randabschnitt (3), der zwischen 0 und 10% Aluminiumoxid enthält, dadurch gekennzeichnet, daß die Teile zusammen verdichtet und gesintert sind, und daß die zusammengesetzte Masse unter Druck nach dem Sintern regeneriert ist.
13. Kolben für eine Verbrennungskraftmaschine, wobei verschiedene Teile aus Aluminium und/oder einem Aluminiumpulver mit unterschiedlichen Anteilen von Aluminiumoxid gebildet sind, mit einem Kopfabschnitt (1) mit wenigstens 10% Aluminiumoxid und einem unteren Randabschnitt (3) mit 0 bis 10% Aluminiumoxid, dadurch gekennzeichnet, daß die Pulver, die den Kopfabschnitt bilden, verdichtet und gesintert, und nach dem Sintern unter Druck geformt sind, und daß die geformte Masse an den unteren Randabschnitt angefügt ist mit oder ohne nachfolgender Regenerierung unter Druck des gesamten Kolbens.
14. Kolben nach Anspruch 12 oder 13, gekennzeichnet durch einen Zwischenbereich (12), in dem Anteil von Aluminiumoxid zwischen demjenigen des Kopfabschnitts und . demjenigen des unteren Randabschnitts liegt.
EP81300719A 1980-02-27 1981-02-20 Gesinterte Formkörper aus Verbundwerkstoffen und ihre Herstellung Expired EP0035348B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8006548 1980-02-27
GB8006548 1980-02-27

Publications (3)

Publication Number Publication Date
EP0035348A2 EP0035348A2 (de) 1981-09-09
EP0035348A3 EP0035348A3 (en) 1981-12-16
EP0035348B1 true EP0035348B1 (de) 1985-01-23

Family

ID=10511704

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81300719A Expired EP0035348B1 (de) 1980-02-27 1981-02-20 Gesinterte Formkörper aus Verbundwerkstoffen und ihre Herstellung

Country Status (9)

Country Link
EP (1) EP0035348B1 (de)
JP (1) JPS56130411A (de)
AU (1) AU6744381A (de)
BR (1) BR8101146A (de)
DE (1) DE3168414D1 (de)
DK (1) DK76381A (de)
ES (1) ES8205142A1 (de)
GB (1) GB2070068B (de)
NO (1) NO810644L (de)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE469908B (sv) * 1986-07-04 1993-10-04 Volvo Ab Förbränningsmotorkomponent med mot förbränningsgaser exponerad yta, vilken är belagd med ett termiskt isolerande material samt sätt att framställa komponenten
JPH01180927A (ja) * 1988-01-13 1989-07-18 Toyota Motor Corp ピストン製造方法
GB9103482D0 (en) * 1991-02-20 1991-04-10 T & N Technology Ltd Pistons
EP0809050B1 (de) * 1996-05-20 2003-08-13 Yamaha Hatsudoki Kabushiki Kaisha Verfahren zur Herstellung einen Kolben für eine Brennkraftmaschine
DE19723868A1 (de) * 1996-11-21 1998-12-10 Seilstorfer Gmbh & Co Metallur Verwendungen eines hochwarmfesten Aluminiumwerkstoffs
EP0870919B1 (de) * 1997-04-10 2003-03-05 Yamaha Hatsudoki Kabushiki Kaisha Brennkraftmaschinenkolben und Verfahren zu seiner Herstellung
FR2842828B1 (fr) * 2002-07-25 2005-04-29 Snecma Moteurs Piece mecanique, et procede de fabrication d'une telle piece mecanique
US6973723B2 (en) * 2003-01-08 2005-12-13 International Engine Intellectual Property Company, Llc Piston formed by powder metallurgical methods
US7299715B2 (en) 2004-05-27 2007-11-27 International Engine Intellectual Property Company, Llc Non-homogeneous engine component formed by powder metallurgy
US7509890B2 (en) 2004-05-27 2009-03-31 International Engine Intellectual Property Company, Llc Non-homogeneous engine component formed by powder metallurgy
CN101966586B (zh) * 2010-10-27 2012-02-01 河南科技大学 内燃机活塞毛坯制造方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE869570C (de) * 1948-10-01 1954-03-08 Maschf Augsburg Nuernberg Ag Kolben fuer Brennkraftmaschinen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE837467C (de) * 1946-07-17 1952-04-28 Aluminium Ind Ag Verfahren zur Herstellung von Leichtmetallkoerpern
GB671606A (en) * 1948-10-01 1952-05-07 Maschf Augsburg Nuernberg Ag Piston for internal combustion engines
US3065073A (en) * 1958-06-09 1962-11-20 Aluminium Ind Ag Method for producing composite bodies of aluminum and sintered aluminum powder
NO791675L (no) * 1978-05-23 1979-11-26 British Internal Combust Eng Kompositt-materiale.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE869570C (de) * 1948-10-01 1954-03-08 Maschf Augsburg Nuernberg Ag Kolben fuer Brennkraftmaschinen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
E. Meyer-Rässler, Sinterwerkstoffe auf Aluminium- und Eisenbasis, MAHLE Colloquium 1973 *

Also Published As

Publication number Publication date
BR8101146A (pt) 1981-09-01
DE3168414D1 (en) 1985-03-07
GB2070068A (en) 1981-09-03
DK76381A (da) 1981-08-28
AU6744381A (en) 1981-09-03
JPS56130411A (en) 1981-10-13
ES499888A0 (es) 1982-06-16
GB2070068B (en) 1984-01-25
ES8205142A1 (es) 1982-06-16
NO810644L (no) 1981-08-28
EP0035348A3 (en) 1981-12-16
EP0035348A2 (de) 1981-09-09

Similar Documents

Publication Publication Date Title
EP0035348B1 (de) Gesinterte Formkörper aus Verbundwerkstoffen und ihre Herstellung
EP0202735A2 (de) Verfahren zur Herstellung eines Verbundkörpers aus Metallpulver
US4499048A (en) Method of consolidating a metallic body
US5878323A (en) Process for producing split type mechanical part
US5903815A (en) Composite powdered metal component
EP0143330A2 (de) Versteifter Kolben
WO2003022490A1 (en) Forged in bushing article
US4501718A (en) Method of consolidating a metallic or ceramic body
US4972898A (en) Method of forming a piston containing a cavity
ES8406635A1 (es) Procedimiento de fabricacion,por metalurgia de polvos,de camisas de motores a base de aleaciones de aluminio de alta resistencia mecanica
JPH03347B2 (de)
ES8705527A1 (es) Un procedimiento de obtencion por pulvimetalurgia de un material a base de aleacion de aluminio
US5666637A (en) Method of manufacturing connecting rod
GB2130509A (en) A method for eliminating or minimising the effects of defects in materials
US6363608B1 (en) Method of manufacturing piston
US20040074335A1 (en) Powder metal connecting rod
WO1979001103A1 (en) Composite materials
US3065073A (en) Method for producing composite bodies of aluminum and sintered aluminum powder
GB2140825A (en) Method of consolidating a metallic or ceramic body
GB2027518A (en) Pistons
JPH02167867A (ja) セラミックス接合体
JPS60208449A (ja) 複合金属
JPS6179019A (ja) コネクテイングロツドとその製造方法
JP2897337B2 (ja) ピストンの製造方法
JP2002130048A (ja) 内燃機関用ピストン

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): BE CH DE FR IT NL SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Designated state(s): BE CH DE FR IT NL SE

17P Request for examination filed

Effective date: 19820211

ITF It: translation for a ep patent filed

Owner name: JACOBACCI & PERANI S.P.A.

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): BE CH DE FR IT LI NL SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19850123

Ref country code: NL

Effective date: 19850123

Ref country code: BE

Effective date: 19850123

REF Corresponds to:

Ref document number: 3168414

Country of ref document: DE

Date of ref document: 19850307

ET Fr: translation filed
REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

26 Opposition filed

Opponent name: MAHLE GMBH

Effective date: 19850928

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19890207

Year of fee payment: 9

ITTA It: last paid annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19890228

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19890228

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19890425

Year of fee payment: 9

RDAG Patent revoked

Free format text: ORIGINAL CODE: 0009271

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: PATENT REVOKED

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

27W Patent revoked

Effective date: 19900915

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL